{

if (is_open() )

{

close();

}

#ifdef WIN32

const size_t pos_slash = libPath.rfind('\\');

const size_t pos_slash_back = libPath.rfind('/');

size_t pos = std::string::npos;

if (pos_slash != std::string::npos && pos_slash > pos_slash_back)

{

pos = pos_slash;

}

else if (pos_slash_back != std::string::npos)

{

pos = pos_slash_back;

}

DLL_DIRECTORY_COOKIE cookie = nullptr;

if (std::string::npos != pos)

{

std::wstring directory(libPath.cbegin(), libPath.cbegin() + pos + 1);

cookie = ::AddDllDirectory(directory.data() );

}

lib_handle = ::LoadLibraryEx(libPath.c_str(), 0, LOAD_LIBRARY_SEARCH_DEFAULT_DIRS);

if (cookie)

{

::RemoveDllDirectory(cookie);

}

#elif POSIX

lib_handle = ::dlopen(libPath.c_str(), RTLD_NOW | RTLD_LOCAL);

#else

#error "Undefine platform"

#endif

if (nullptr == lib_handle)

{

#ifdef POSIX

std::cout << ::dlerror() << std::endl;

#endif

return false;

}

return true;

{

if (lib_handle)

{

#ifdef WIN32

::FreeLibrary(lib_handle);

#elif POSIX

::dlclose(lib_handle);

#else

#error "Undefine platform"

#endif

lib_handle = nullptr;

}

{

if (lib_handle)

{

#ifdef WIN32

*addr = reinterpret_cast<void *(*)(void *)>(::GetProcAddress(lib_handle, symbolName.c_str() ) );

return nullptr != *addr;

#elif POSIX

char *error = ::dlerror();

*addr = reinterpret_cast<void *(*)(void *)>(::dlsym(lib_handle, symbolName.c_str() ) );

error = ::dlerror();

return nullptr == error;

#else

#error "Undefine platform"

#endif

}

return false;

{

if (lib_handle)

{

#ifdef WIN32

*addr = reinterpret_cast<void *(*)(void *)>(::GetProcAddress(lib_handle, symbolName) );

return nullptr != *addr;

#elif POSIX

char *error = ::dlerror();

*addr = reinterpret_cast<void *(*)(void *)>(::dlsym(lib_handle, symbolName) );

error = ::dlerror();

return nullptr == error;

#else

#error "Undefine platform"

#endif

}

return false;